I don't think it's that the boss is cruel, but that he invited the chef to cook. Although the restaurant is often too busy, the boss won't help. As the boss invited the chef, he was afraid that the bad cooking would affect his business, so he wouldn't cook again. This is also the idea of being a boss. No matter how busy the small restaurant business is, it is not easy, so it will be possible to save money as much as possible.